CVE-2023-53468 (GCVE-0-2023-53468)

Vulnerability from cvelistv5 – Published: 2025-10-01 11:42 – Updated: 2026-05-11 19:45
VLAI
Title
ubifs: Fix memory leak in alloc_wbufs()
Summary
In the Linux kernel, the following vulnerability has been resolved: ubifs: Fix memory leak in alloc_wbufs() kmemleak reported a sequence of memory leaks, and show them as following: unreferenced object 0xffff8881575f8400 (size 1024): comm "mount", pid 19625, jiffies 4297119604 (age 20.383s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff8176cecd>] __kmalloc+0x4d/0x150 [<ffffffffa0406b2b>] ubifs_mount+0x307b/0x7170 [ubifs] [<ffffffff819fa8fd>] legacy_get_tree+0xed/0x1d0 [<ffffffff81936f2d>] vfs_get_tree+0x7d/0x230 [<ffffffff819b2bd4>] path_mount+0xdd4/0x17b0 [<ffffffff819b37aa>] __x64_sys_mount+0x1fa/0x270 [<ffffffff83c14295>] do_syscall_64+0x35/0x80 [<ffffffff83e0006a>] entry_SYSCALL_64_after_hwframe+0x46/0xb0 unreferenced object 0xffff8881798a6e00 (size 512): comm "mount", pid 19677, jiffies 4297121912 (age 37.816s) hex dump (first 32 bytes): 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk backtrace: [<ffffffff8176cecd>] __kmalloc+0x4d/0x150 [<ffffffffa0418342>] ubifs_wbuf_init+0x52/0x480 [ubifs] [<ffffffffa0406ca5>] ubifs_mount+0x31f5/0x7170 [ubifs] [<ffffffff819fa8fd>] legacy_get_tree+0xed/0x1d0 [<ffffffff81936f2d>] vfs_get_tree+0x7d/0x230 [<ffffffff819b2bd4>] path_mount+0xdd4/0x17b0 [<ffffffff819b37aa>] __x64_sys_mount+0x1fa/0x270 [<ffffffff83c14295>] do_syscall_64+0x35/0x80 [<ffffffff83e0006a>] entry_SYSCALL_64_after_hwframe+0x46/0xb0 The problem is that the ubifs_wbuf_init() returns an error in the loop which in the alloc_wbufs(), then the wbuf->buf and wbuf->inodes that were successfully alloced before are not freed. Fix it by adding error hanging path in alloc_wbufs() which frees the memory alloced before when ubifs_wbuf_init() returns an error.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6665 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < 1f206002c6bc302bface871ef3f72c0bbcaa931c (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < bf50229494f0443b3f08427d7df63e5a7e2a796a (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < 3e29634eb56e6547272fe4e568f63421f8b3b9fa (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < 26ec45f1c504e15268383019df139d7983f1e67f (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < e11f36d3bc4d23f620754a948fe7b82b63dcb185 (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < 4a1ff3c5d04b9079b4f768d9a71b51c4af578dd2 (git)
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Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 5.4.235 , ≤ 5.4.* (semver)
Unaffected: 5.10.173 , ≤ 5.10.* (semver)
Unaffected: 5.15.100 , ≤ 5.15.* (semver)
Unaffected: 6.1.18 , ≤ 6.1.* (semver)
Unaffected: 6.2.5 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nubifs: Fix memory leak in alloc_wbufs()\n\nkmemleak reported a sequence of memory leaks, and show them as following:\n\n  unreferenced object 0xffff8881575f8400 (size 1024):\n    comm \"mount\", pid 19625, jiffies 4297119604 (age 20.383s)\n    hex dump (first 32 bytes):\n      00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n      00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    backtrace:\n      [\u003cffffffff8176cecd\u003e] __kmalloc+0x4d/0x150\n      [\u003cffffffffa0406b2b\u003e] ubifs_mount+0x307b/0x7170 [ubifs]\n      [\u003cffffffff819fa8fd\u003e] legacy_get_tree+0xed/0x1d0\n      [\u003cffffffff81936f2d\u003e] vfs_get_tree+0x7d/0x230\n      [\u003cffffffff819b2bd4\u003e] path_mount+0xdd4/0x17b0\n      [\u003cffffffff819b37aa\u003e] __x64_sys_mount+0x1fa/0x270\n      [\u003cffffffff83c14295\u003e] do_syscall_64+0x35/0x80\n      [\u003cffffffff83e0006a\u003e] entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\n  unreferenced object 0xffff8881798a6e00 (size 512):\n    comm \"mount\", pid 19677, jiffies 4297121912 (age 37.816s)\n    hex dump (first 32 bytes):\n      6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk\n      6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk\n    backtrace:\n      [\u003cffffffff8176cecd\u003e] __kmalloc+0x4d/0x150\n      [\u003cffffffffa0418342\u003e] ubifs_wbuf_init+0x52/0x480 [ubifs]\n      [\u003cffffffffa0406ca5\u003e] ubifs_mount+0x31f5/0x7170 [ubifs]\n      [\u003cffffffff819fa8fd\u003e] legacy_get_tree+0xed/0x1d0\n      [\u003cffffffff81936f2d\u003e] vfs_get_tree+0x7d/0x230\n      [\u003cffffffff819b2bd4\u003e] path_mount+0xdd4/0x17b0\n      [\u003cffffffff819b37aa\u003e] __x64_sys_mount+0x1fa/0x270\n      [\u003cffffffff83c14295\u003e] do_syscall_64+0x35/0x80\n      [\u003cffffffff83e0006a\u003e] entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThe problem is that the ubifs_wbuf_init() returns an error in the\nloop which in the alloc_wbufs(), then the wbuf-\u003ebuf and wbuf-\u003einodes\nthat were successfully alloced before are not freed.\n\nFix it by adding error hanging path in alloc_wbufs() which frees\nthe memory alloced before when ubifs_wbuf_init() returns an error."
          }
        ],
        "id": "CVE-2023-53468",
        "lastModified": "2026-06-17T06:45:24.653",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-10-01T12:15:48.830",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/1f206002c6bc302bface871ef3f72c0bbcaa931c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/26ec45f1c504e15268383019df139d7983f1e67f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/3e29634eb56e6547272fe4e568f63421f8b3b9fa"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/4a1ff3c5d04b9079b4f768d9a71b51c4af578dd2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/bf50229494f0443b3f08427d7df63e5a7e2a796a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e11f36d3bc4d23f620754a948fe7b82b63dcb185"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-401"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:17:27+00:00",
      "cve": "CVE-2023-53468",
      "id": "CVE-2023-53468",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "260",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ubifs: Fix memory leak in alloc_wbufs()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53468.json",
      "version": "3"
    }
  }
}



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